private async Task <FacebookAccessTokenInfo> GetAccessTokenInfo(OAuthAccessToken token)
{
using (HttpClient client = new HttpClient())
{
var url = "https://graph.facebook.com/debug_token";
url += $"?input_token={token.AccessToken}";
url += $"&access_token={token.AccessToken}";
var result = await client.GetAsync(url);
if (!result.IsSuccessStatusCode)
{
return(null);
}
var content = await result.Content.ReadAsStringAsync();
var response = JsonConvert.DeserializeObject <FacebookAccessTokenInfoResponse>(content, new JsonSerializerSettings {
ContractResolver = new DefaultContractResolver {
NamingStrategy = new SnakeCaseNamingStrategy()
}
});
return(response.Data);
}
}
public async Task <IOAuthUserInfo> GetUserInfoAsync(OAuthAccessToken token)
{
var facebookInfo = await GetAccessTokenInfo(token);
if (facebookInfo == null)
{
return(null);
}
return(await GetUserInfoAsync(facebookInfo.UserId, token));
}
public async Task <IOAuthUserInfo> GetUserInfoAsync(OAuthAccessToken token)
{
using (HttpClient client = new HttpClient())
{
client.DefaultRequestHeaders.Add("Authorization", $"{token.TokenType} {token.AccessToken}");
var response = await client.GetAsync("https://openidconnect.googleapis.com/v1/userinfo");
if (!response.IsSuccessStatusCode)
{
return(null);
}
var content = await response.Content.ReadAsStringAsync();
return(JsonConvert.DeserializeObject <GoogleUserInfo>(content, new JsonSerializerSettings {
ContractResolver = new DefaultContractResolver {
NamingStrategy = new SnakeCaseNamingStrategy()
}
}));
}
}
private async Task <IOAuthUserInfo> GetUserInfoAsync(string userId, OAuthAccessToken token)
{
using (HttpClient client = new HttpClient())
{
var url = $"https://graph.facebook.com/v3.2/{userId}";
url += $"?access_token={token.AccessToken}";
url += "&fields=first_name,last_name,name,picture";
var result = await client.GetAsync(url);
if (!result.IsSuccessStatusCode)
{
return(null);
}
var content = await result.Content.ReadAsStringAsync();
return(JsonConvert.DeserializeObject <FacebookUserInfo>(content, new JsonSerializerSettings {
ContractResolver = new DefaultContractResolver {
NamingStrategy = new SnakeCaseNamingStrategy()
}
}));
}
}
private IEnumerable <Microsoft.AspNetCore.Authentication.AuthenticationToken> GenerateAuthenticationTokens(OAuthAccessToken token)
{
var authTokens = new List <Microsoft.AspNetCore.Authentication.AuthenticationToken>();
if (token != null)
{
if (!string.IsNullOrWhiteSpace(token.AccessToken))
{
authTokens.Add(new Microsoft.AspNetCore.Authentication.AuthenticationToken
{
Name = "access_token",
Value = token.AccessToken
});
}
if (!string.IsNullOrEmpty(token.TokenType))
{
authTokens.Add(new Microsoft.AspNetCore.Authentication.AuthenticationToken {
Name = "token_type", Value = token.TokenType
});
}
if (token.ExpiresIn > 0)
{
var expiresAt = DateTime.UtcNow + TimeSpan.FromSeconds(token.ExpiresIn);
authTokens.Add(new Microsoft.AspNetCore.Authentication.AuthenticationToken
{
Name = "expires_at",
Value = expiresAt.ToString("o", CultureInfo.InvariantCulture)
});
}
}
return(authTokens);
}
